Fix use of upState as hitTestState on SimpleButton, and null downState
Fix use of upState as hitTestState on SimpleButton, and null downState

NenadBojkovski/openfl,openfl/openfl,openfl/openfl,Gama11/openfl,Gama11/openfl,NenadBojkovski/openfl,Gama11/openfl,Gama11/openfl,openfl/openfl